This is the shelter I volunteer for (see link below). I haven’t read any of these links yet, but it’s a list of resources on cat behaviour so maybe you can find something useful there.
I have since moved her litter box and water and food bowl in there also and have kept the door closed.
Hopefully when I go to bed tonight she will join me on the bed as she did the first night she was with me since in the enclosed room, she has no place to escape to............